modify dependencies
publishConfigのURLを修正、repositoryなどを追加
package.jsonからprivate npmの指定を削除, 依存関係を修正
実装整理
add message listener interface.
fixed comments and test programs.
fixed test programs.
added maxForkCount in case of worker forked too many times.
added some descriptions
Apply logger change
fixed proteus-logger integration bug.
merged with origin/develop
fixed merge miss
add cluster.sendMessage() to send message from master to workers.
modified clsuter.js to handle arguments for worker. added english description